ASUS
ASUS PRIME B850M-A WIFI-CSM AMD B850 Socket AM5 micro ATX
Part number PRIME B850M-A WIFI-CSM
ASUS PRIME B850M-A WIFI-CSM AMD AM5 B850 MATX MOTHERBOARD DDR5
AMD Socket AM5 AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series PC micro ATX AMD B850 7.1 channels DDR5-SDRAM 4 DIMM Maximum internal memory: 256 GB HDD & SSD M.2, SATA III RAID support Number of storage drives supported: 7 BIOS type: UEFI AMI 256 Mbit 2.5 Gigabit Ethernet Wi-Fi Wi-Fi 6E (802.11ax) Bluetooth 5.3
Manufacturer ASUS
Part number PRIME B850M-A WIFI-CSM
Condition New
Category System Components › Motherboards 1GPA category Hardware
Manufacturer MSRP
$179.99
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Stock and final pricing are confirmed by your rep on the quote. Catalog dated September 30, 2026.
Overview
B850M-A WIFI-CSM
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850M-A WIFI-CSM motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It’s designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
Specifications
Processor
Processor manufacturer AMD Processor socket Socket AM5 Compatible processor series AMD Ryzen 7000 Series, AMD Ryzen 8000 Series, AMD Ryzen 9000 Series Supported processor sockets Socket AM5
Memory
Supported memory types DDR5-SDRAM Number of memory slots 4 Memory slots type DIMM Memory channels Dual-channel ECC сompatibility ECC & Non-ECC Maximum internal memory 256 GB Unbuffered memory Yes
Storage controllers
Supported storage drive types HDD & SSD Supported storage drive interfaces M.2, SATA III Number of HDDs supported 4 Number of storage drives supported 7 RAID support Yes RAID levels 0, 1, 5, 10
Graphics
Parallel processing technology support Not supported
Internal I/O
USB 2.0 connectors 2 USB 3.2 Gen 1 (3.1 Gen 1) connectors 2 Number of SATA III connectors 4 S/PDIF out connector Yes Front panel audio connector Yes Front panel connector Yes ATX Power connector (24-pin) Yes CPU fan connector Yes Number of chassis fan connectors 3 Chassis intrusion connector Yes EPS power connector (8-pin) Yes Number of COM connectors 1 TPM connector Yes 12V power connector Yes RGB LED pin header Yes
Rear panel I/O ports
USB 2.0 ports quantity 4 USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity 2 USB 3.2 Gen 2 (3.1 Gen 2) Type-A ports quantity 2 Ethernet LAN (RJ-45) ports 1 HDMI ports quantity 1 DisplayPorts quantity 2 WiFi-AP antenna jack 1
Network
Ethernet LAN Yes Ethernet interface type 2.5 Gigabit Ethernet Wi-Fi Yes Top Wi-Fi standard Wi-Fi 6E (802.11ax) Wi-Fi standards Wi-Fi 6E (802.11ax) Bluetooth Yes Bluetooth version 5.3
Features
Motherboard chipset AMD B850 Audio output channels 7.1 channels Product colour Black, White Component for PC Motherboard form factor micro ATX Motherboard chipset family AMD Windows operating systems supported Windows 10 x64, Windows 11
Expansion slots
PCI Express x16 (Gen 4.x) slots 1 PCI Express x16 (Gen 5.x) slots 1 Number of M.2 (M) slots 3 1st M.2 largest key size 2280 1st M.2 highest PCI Express generation 5.0 2nd M.2 largest key size 2280 2nd M.2 highest PCI Express generation 4.0 3rd M.2 largest key size 2280 3rd M.2 highest PCI Express generation 4.0
BIOS
BIOS type UEFI AMI BIOS memory size 256 Mbit
Weight & dimensions
Width 244 mm Depth 244 mm
Packaging content
Cables included SATA Antenna included Yes Screws included Yes
Product photos and overview provided by the manufacturer through Icecat. Confirm specifications with your rep before ordering.
